Rudolf Gompper

Electron-rich and electron-poor pentalene derivatives

Abstract Bisdialkylaminoalkylidene derivatives of dihydroindeno[2,1-a]indene as electron-donors, and dihydroindeno-[2,1-a]indene-5,10-dione-biscyanoimines and bisdicyanomethylene-dihydroindeno[1,2-b]fluorenes as acceptors have been prepared and found to form charge transfer complexes with interesting electrical conductivities.

Zur struktur eines donor-akzeptor-substituierten [4]-annulens: das photoelektronenspektrum des bis(diäthylamino)-bis(äthoxy-carbonyl)-cyclobutadiens

Zusammenfassung Die He(I)-Photoelektronen(PE)-Spektren des Donor-Akzeptor-substituierten Cyclobutadiens ( 1 ), Cyclooctatetraens ( 4 ), Athylens ( 2 ) und Acetylens ( 5 ) wurden aufgenommen und mit Hilfe von CNDO/S-Rechnungen interpretiert. Nach PE-, ESCA-, NMR- und UV-Daten sowie Modellrechnungen ist das “push-pull”-substituierte Cyclobutadien ( 1 ) das erste gesicherte Beispiel eines delokalisierten [4]-Annulens.

Synthesis and Electronic Properties of Tetrakis[4‐(pyrimidyl)phenyl]methanes − A Novel Class of Electronically Active Nanometer‐Sized Scaffolds

Tetrakis[4-(arylpyrimidyl)phenyl]methanes 4 can be readily synthesized by using a highly convergent vinamidinium salt cyclocondensation strategy. The conjugated side-chains of these novel nanostructures display interesting cooperative electronic features such as intramolecular exciplex coupling and ECEC redox processes in the cathodic region.

Y-aromatic dications and stabilized trimethylenemethanes

Abstract Calculated heats of formation of thio and amino substituted planar triplet trimethylenemethanes are comparable to those of the corresponding methylenecyclopropanes. Y-Aromatic [1]-tris(1,3-dithiol-2-yl)[0.0.0]monomethinium bistetrafluoroborates, prepared via novel 6.6-diformyl-1,3-dithiafulvenes and the corresponding bisdithioacetals, can be reversibly reduced to stable radical cations and neutral compounds tentatively assigned as stable trimethylenemethanes.

Reaktion elektronenreicher Azole

Summary 2,4-Bis-dimethylamino-thiazoles and -imidazoles readily react with electrophiles and oxidants to form substitution products, crystalline dipolar Meisenheimer complexes, “viologens” and radical cation salts, respectively.

2.4.5-Tris-(diethylamino)-4H-imidazol und davon abgeleitete fulvene und fulvalene

Zusammenfassung New fulvenes, a fulvalene and a 4H-imidazole have been obtained from 2.4.5-tris-diethylamino-dehydroimidazolium chloride. According to MNDO calculations the CH tautomers of aminoimidazoles can be more stable than the NH forms.

Characterisation of New Organic Ligand-Based Magnets: [MNTTP] [TCNE] and [MNTTP][TCNQ]

Abstract We analysed the temperature and field dependence of the magnetisation of the electron transfer salts meso-(Tetratolylporphinato)manganese(III)-tetracyanoethenide, [MnIIITTP]:: +[TCNE]− and meso-(Tetratolylporphinato)manganese(III)-7,7,8,8-tetracyano-p-quinodimethane [MnIIITTP]:: +[TCNQ]−. They show cooperative magnetic behaviour for temperatures below 10 K.

2,4,6,8-Tetraazabarbaralanes: Models for tetraazasemibullvalenes

Abstract 3,7-Diethoxy-1,5-dimethyl-2,4,6,8-tetraaza-bicyclo[3.3.1]nona-2,6-diene (7), readily obtained from the corresponding urea derivative, can be oxidized to afford 3,7-diethoxy-1,5- dimethyl-2,4,6,8-tetraazabarbaralane (9) whose crystal structure corresponds to a localized molecule. On heating, 9 gives rise to 2-ethoxy-4,6-dimethyl-pyrimidine.

Stable dications of tetraamino-p-benzoquinones

Abstract N-Peralkyl-tetraamino-p-benzoquinones react with oxidants to form crystalline dication salts. Reductive acylation gives rise to 1,4-bisacyloxy-2,3,5,6-tetraaminobenzenes which can be oxidized to benzene dication salts.

Dipolare zwischenstufen bei thio-claisen-umlagerungen von ketenmercaptalen

Abstract Alkyl α-(2-acyl-allyl)-dithiocarboxylates, formed from alkyl dithiocarboxylates and 2-acyl-allyl halides in the presence of ethyldiisopropylamine, rearrange to dihydrothiopyranes.